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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8952ca24737bf9e38ebd1a76f25888955c08eb839815cba58df9ad7557c92270' 
  AND token = 'xEjIH9EVCvnh3Gp76Fn//Fpbkt/UG8NjeEdZbIvgQ5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}